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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!mhuxv!mhuxh!mhuxj!mhuxn!ihnp4!chinet!megabyte
From: megabyte@chinet.UUCP (Mark E. Sunderlin)
Newsgroups: net.unix
Subject: cc(1): Questions about "-i"
Message-ID: <374@chinet.UUCP>
Date: Mon, 16-Jun-86 15:58:25 EDT
Article-I.D.: chinet.374
Posted: Mon Jun 16 15:58:25 1986
Date-Received: Wed, 18-Jun-86 04:26:28 EDT
Reply-To: megabyte@chinet.UUCP (Mark E. Sunderlin)
Distribution: net
Organization: chi-net, Public Access UN*X, Chicago IL
Lines: 34
Keywords: SYSIII,cc,memory resident
Summary: NOT SYSV, but sysIII


   My SYSIII machine has a -i option to its ld(1) command. It is described
as such:
-i	Seperate the program text and data areas when the output file is
executed.  Text occupies segement 0; its origin is 0x0000. Data and bss
occupy segement 1;data's origin is 0x0000. Bss follows data.

I am unsuure as to the exact effects of this option.  If I understand it,
when my program runs it is in memory as such:

_______________________
| program   code      |   / \ Lower addresses
-----------------------    |
| program   data      |    |
-----------------------   \ / Higher addresses

As opposed to having the program instructions and data mixed in among each
other.  I have a friend who says this is true and it is done so that two 
people running the same program can share text segments and each have its
own data area.  This saving memory and time.  

Could some one explain the -i option to me.  I don't even see it in my SYSV
documentation.  Also, does UN*X keep only one copy of a program in memory,
even if two or more people are running it?

If it means anything , I am running on a Zilog S8000 wih ZEUS 3.21 which is a
sysIII port.  
-- 
_________________________________________________________________________
UUCP:	(1) seismo!dolqci!irsdcp!scsnet!sunder		Mark E. Sunderlin
	(2) ihnp4!chinet!megabyte			aka Dr. Megabyte
CIS:	74026,3235					(202) 634-2529
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